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   1 /**
   2  * Copyright (c) 2010-2023 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.systeminfo.internal.discovery;
  14
  15 import static org.openhab.binding.systeminfo.internal.SysteminfoBindingConstants.THING_TYPE_COMPUTER;
  16
  17 import java.net.InetAddress;
  18 import java.net.UnknownHostException;
  19 import java.util.Collections;
  20 import java.util.Set;
  21
  22 import org.eclipse.jdt.annotation.NonNullByDefault;
  23 import org.openhab.binding.systeminfo.internal.SysteminfoBindingConstants;
  24 import org.openhab.core.config.discovery.AbstractDiscoveryService;
  25 import org.openhab.core.config.discovery.DiscoveryResult;
  26 import org.openhab.core.config.discovery.DiscoveryResultBuilder;
  27 import org.openhab.core.config.discovery.DiscoveryService;
  28 import org.openhab.core.thing.ThingTypeUID;
  29 import org.openhab.core.thing.ThingUID;
  30 import org.osgi.service.component.annotations.Component;
  31 import org.slf4j.Logger;
  32 import org.slf4j.LoggerFactory;
  33
  34 /**
  35  * Discovery service implementation for the Systeminfo binding. It creates {@link DiscoveryResult} with
  36  * {@link #DEFAULT_THING_LABEL}. The discovered Thing will have id - the hostname or {@link #DEFAULT_THING_ID}'
  37  *
  38  * @author Svilen Valkanov - Initial contribution
  39  * @author Wouter Born - Add null annotations
  40  */
  41 @NonNullByDefault
  42 @Component(service = DiscoveryService.class, configurationPid = "discovery.systeminfo")
  43 public class SysteminfoDiscoveryService extends AbstractDiscoveryService {
  44     public static final String DEFAULT_THING_ID = "unknown";
  45     public static final String DEFAULT_THING_LABEL = "Local computer";
  46
  47     private final Logger logger = LoggerFactory.getLogger(SysteminfoDiscoveryService.class);
  48
  49     private static final Set<ThingTypeUID> SUPPORTED_THING_TYPES_UIDS = Collections.singleton(THING_TYPE_COMPUTER);
  50
  51     private static final int DISCOVERY_TIME_SECONDS = 30;
  52     private static final String THING_UID_VALID_CHARS = "A-Za-z0-9_-";
  53     private static final String HOST_NAME_SEPERATOR = "_";
  54
  55     public SysteminfoDiscoveryService() {
  56         super(SUPPORTED_THING_TYPES_UIDS, DISCOVERY_TIME_SECONDS);
  57     }
  58
  59     @Override
  60     protected void startScan() {
  61         logger.debug("Starting system information discovery !");
  62         String hostname;
  63
  64         try {
  65             hostname = getHostName();
  66             if (hostname.isEmpty()) {
  67                 throw new UnknownHostException();
  68             }
  69             if (!hostname.matches("[" + THING_UID_VALID_CHARS + "]*")) {
  70                 hostname = hostname.replaceAll("[^" + THING_UID_VALID_CHARS + "]", HOST_NAME_SEPERATOR);
  71             }
  72         } catch (UnknownHostException ex) {
  73             hostname = DEFAULT_THING_ID;
  74             logger.info("Hostname can not be resolved. Computer name will be set to the default one: {}",
  75                     DEFAULT_THING_ID);
  76         }
  77
  78         ThingTypeUID computerType = SysteminfoBindingConstants.THING_TYPE_COMPUTER;
  79         ThingUID computer = new ThingUID(computerType, hostname);
  80         thingDiscovered(DiscoveryResultBuilder.create(computer).withLabel(DEFAULT_THING_LABEL).build());
  81     }
  82
  83     protected String getHostName() throws UnknownHostException {
  84         InetAddress addr = InetAddress.getLocalHost();
  85         String hostname = addr.getHostName();
  86         return hostname;
  87     }
  88 }